一、用连词when、while、after或before填空
1. He brushed his teeth he went to bed.
2. The children asked some questions the teacher left the classroom.
3. I was writing a letter last night, he was chatting with his friends on the Internet.
4. Mr Black went out he answered the phone.
5. They were playing tennis it began to rain heavily.
6. Rebecca went to bed she got home because she was so tired.
7. People should be very careful they cross busy roads.
8. Paul found somebody's wallet on the ground he was walking to the bus stop.

1. before
2. before
3. While
4. after
5. when
6. after
7. when
8. while

二、用since、till或until合并句子或连词成句
1. We must wait here. / He comes back.
2. You can’t play badminton. / You finish your homework.
3. We first met at primary school. / We have been good friends.
4. People usually don’t know the value of health. / They lose it.
5. The mother hasn’t had a good night’s sleep. / Her baby was born.
6. I haven’t seen Mr Smith / last week
7. late at night / the meeting continued
8. half past seven / the volleyball match won’t start

1. We must wait here till/until he comes back.
2. You can't play badminton till/until you finish your homework.
3. We have been good friends since we first met at primary school.
4. People usually don't know the value of health till/until they lose it.
5. The mother hasn't had a good night's sleep since her baby was born.
6. I haven't seen Mr Smith since last week.
7. The meeting continued till/until late at night.
8. The volleyball match won't start till/until half past seven.

三、用as soon as或whenever填空
1. we got out of the car, it started to rain.
2. You are welcome to come and stay with us you like.
3. she comes to my home, she brings me a bunch of flowers.
4. I see them, they are talking about football.
5. I’m going to have a shower I get home.
6. He will be back tomorrow. I’ll give him the message I see him.

1. As soon as
2. whenever
3. Whenever
4. Whenever
5. as soon as
6. as soon as